it's the second-straight day he will be talking about obama care. as abc's karen travers tells us, that's by design. good morning, karen. >> reporter: good morning, john. good morning, diana. president obama highlighted the progress at healthcare.gov. but once again, he reminded americans that the health care law is not just a website. and he had a strong message for republicans. he said the health care law is here to stay. >> my main message today is we're not going back. after just the first month, despite all of the problems in the rollout, about 500,000 people across the country are poised to gain health care coverage threw marketplaces and medicaid beginning on january 1st. >> reporter: but the white house says the problems are almost fixed. over the next three weeks they'll make a big push to get people enrolled so they have health insurance by january 1st. john and diana? >> karen, thank you. >>> now, to a breaking story from mexico. a potential nightmare for u.s. homeland security. a truck carrying radioactive material has been stolen. that